Expansion valve detection method and device, medium and equipment

Abstract

The invention discloses an expansion valve detection method and device, a medium and equipment, when a self-checking instruction is triggered, a first expansion valve and a second expansion valve are controlled to be opened to a preset opening degree, and meanwhile, the first outer pipe temperature of a first system and the second outer pipe temperature of a second system at the moment are obtained; then the first system is controlled to operate in a preset working mode, then the third outer pipe temperature of the first system and the fourth outer pipe temperature of the second system at the moment are obtained, and finally the first temperature difference between the third outer pipe temperature and the first outer pipe temperature and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature are compared; and whether the first expansion valve is wrongly installed or damaged or not is judged. The method has the core advantages that the faults of the expansion valve can be found and diagnosed in time through accurate analysis of the temperature difference, and the problem that in a traditional method, the performance of an air conditioner is reduced or normal operation cannot be achieved due to the fact that the faults of the expansion valve cannot be found as early as possible is solved.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioners, and particularly to a method, device, medium and equipment for detecting an expansion valve. Background Art

[0002] A multi-system air conditioner includes at least two air conditioner control systems, and each air conditioner control system is respectively configured with an expansion valve. During the production and installation processes of these multi-system air conditioners, it is easy to have the situation that the expansion valve is installed wrongly or damaged. If the problem of the wrongly installed or damaged expansion valve cannot be discovered and solved in time during processes such as production and detection, and the products with such defects are directly shipped out of the factory without being detected and even flow into the market, a series of adverse consequences will be caused. Specifically, after the product is put into use, due to the abnormality of the expansion valve, the performance of the air conditioner will decline, and it may even not operate normally, which will further cause consumers to be dissatisfied with the product quality and lead to customer complaints. Summary of the Invention

[0003] Based on this, it is necessary to provide a method, device, medium and equipment for detecting an expansion valve to solve the problem in the prior art that the wrongly installed or damaged expansion valve in a multi-system air conditioner cannot be discovered in time.

[0004] In a first aspect, an embodiment of the present application provides a method for detecting an expansion valve, which is characterized in that it is applied to a multi-system air conditioner, and the multi-system air conditioner includes at least two air conditioner systems. The method includes:

[0005] When a self-check instruction is triggered, control the first expansion valve of the first system and the second expansion valve of the second system to open to a first preset opening degree, and obtain the current first outer pipe temperature of the first system and the current second outer pipe temperature of the second system; wherein, the first system is the air conditioner system indicated by the self-check instruction to perform a fault detection among the at least two air conditioner systems, and the second system is another air conditioner system among the at least two air conditioner systems except the first system;

[0006] Control the first system to operate in a preset working mode, and obtain the current third outer pipe temperature of the first system and the current fourth outer pipe temperature of the second system;

[0007] Judge the fault condition of the first expansion valve according to a first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and a second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature.

[0008] In some embodiments of the present application, the fault conditions include correct installation and incorrect installation of the first expansion valve. The preset operating mode is the refrigeration mode. Judging the fault condition of the first expansion valve according to the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature includes:

[0009] If the first temperature difference is greater than a preset first temperature difference threshold, and the second temperature difference is less than or equal to the first temperature difference threshold, it is determined that the first expansion valve is correctly installed;

[0010] If the first temperature difference is less than or equal to the first temperature difference threshold, and the second temperature difference is greater than the first temperature difference threshold, it is determined that the first expansion valve is incorrectly installed.

[0011] In some embodiments of the present application, the method further includes:

[0012] If the first temperature difference is greater than the first temperature difference threshold, and the second temperature difference is greater than the first temperature difference threshold, it is determined that the outer pipelines between the first system and the second system are connected;

[0013] If the first temperature difference is less than or equal to the first temperature difference threshold, and the second temperature difference is less than or equal to the first temperature difference threshold, it is determined that the multi-system air conditioner is abnormal.

[0014] In some embodiments of the present application, the fault conditions include correct installation and incorrect installation of the first expansion valve. The preset operating mode is the heating mode. Judging the fault condition of the first expansion valve according to the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature includes:

[0015] If the first temperature difference is less than or equal to a preset second temperature difference threshold, and the second temperature difference is greater than the second temperature difference threshold, it is determined that the first expansion valve is correctly installed;

[0016] If the first temperature difference is greater than the second temperature difference threshold, and the second temperature difference is less than or equal to the second temperature difference threshold, it is determined that the first expansion valve is incorrectly installed.

[0017] In some embodiments of the present application, the method further includes:

[0018] If the first temperature difference is less than or equal to the second temperature difference threshold, and the second temperature difference is less than or equal to the second temperature difference threshold, it is determined that the outer pipelines between the first system and the second system are connected;

[0019] If the first temperature difference is greater than the second temperature difference threshold and the second temperature difference is greater than the second temperature difference threshold, it is determined that the multi-system air conditioner is abnormal.

[0020] In some embodiments of the present application, the method further includes:

[0021] When a commodity inspection instruction is received, control the third expansion valve of the third system to open to a second preset opening degree, and control the fourth expansion valve of the fourth system to open to a third preset opening degree; wherein, the third system is the air conditioner system in the at least two air conditioner systems for which the commodity inspection instruction indicates a fault detection, and the fourth system is another air conditioner system in the at least two air conditioner systems other than the third system, and the second preset opening degree is different from the third preset opening degree.

[0022] Control the first system and the second system to operate in a preset working mode, obtain the first exhaust temperature and the first phase current of the first system at present, and obtain the second exhaust temperature and the second phase current of the second system at present;

[0023] Judge the qualification status of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the phase current difference between the second phase current and the first phase current; wherein, the qualification status includes qualified and unqualified.

[0024] In some embodiments of the present application, the second preset opening degree is greater than the third preset opening degree, the preset working mode works as a refrigeration mode at a preset frequency, and the judging the qualification status of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the current difference between the second phase current and the first phase current includes:

[0025] If the first judgment condition is satisfied, it is determined that the multi-system air conditioner is qualified; if the first judgment condition is not satisfied, it is determined that the multi-system air conditioner is unqualified; wherein, the first judgment condition is that the third temperature difference is greater than a preset third temperature difference threshold, and the phase current difference is greater than a preset first phase current threshold.

[0026] In some embodiments of the present application, the second preset opening degree is greater than the third preset opening degree, the preset working mode works as a heating mode at a preset frequency, and the judging the qualification status of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the current difference between the second phase current and the first phase current includes:

[0027] If the second judgment condition is met, it is determined that the multi-system air conditioner is qualified; if the second judgment condition is not met, it is determined that the multi-system air conditioner is unqualified. Wherein, the second judgment condition is that the third temperature difference is less than or equal to a preset fourth temperature difference threshold, and the phase current difference is greater than a preset second phase current threshold.

[0028] In a second aspect, an embodiment of the present application further provides an expansion valve detection device, which includes:

[0029] A first parameter acquisition module, configured to, when a self-check instruction is triggered, control the first expansion valve of the first system and the second expansion valve of the second system to open to a first preset opening degree, and acquire the first outer tube temperature of the current first system and the second outer tube temperature of the current second system. Wherein, the first system is the air conditioner system for which the self-check instruction indicates a fault detection among the at least two air conditioner systems, and the second system is another air conditioner system among the at least two air conditioner systems other than the first system; and control the first system to operate in a preset working mode, and acquire the third outer tube temperature of the current first system and the fourth outer tube temperature of the current second system.

[0030] A first detection module, configured to judge the fault condition of the first expansion valve according to the first temperature difference between the third outer tube temperature and the first outer tube temperature, and the second temperature difference between the fourth outer tube temperature and the second outer tube temperature.

[0031] In some embodiments of the present application, the expansion valve detection device further includes:

[0032] A control module, configured to, when a commodity inspection instruction is received, control the third expansion valve of the third system to open to a second preset opening degree, and control the fourth expansion valve of the fourth system to open to a third preset opening degree. Wherein, the third system is the air conditioner system for which the commodity inspection instruction indicates a fault detection among the at least two air conditioner systems, and the fourth system is another air conditioner system among the at least two air conditioner systems other than the third system, and the second preset opening degree and the third preset opening degree are different in opening degree.

[0033] A second parameter acquisition module, configured to control the first system and the second system to operate in a preset working mode, acquire the first exhaust temperature and the first phase current of the current first system, and acquire the second exhaust temperature and the second phase current of the current second system.

[0034] A second detection module, configured to judge the qualification condition of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the phase current difference between the second phase current and the first phase current.

[0035] In a third aspect, an embodiment of the present application further provides a terminal device, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the computer program is executed by the processor, the steps in the above-mentioned expansion valve detection method are implemented.

[0036] In a fourth aspect, an embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps in the above-mentioned expansion valve detection method are implemented.

[0037] In a fifth aspect, an embodiment of the present application further provides a computer program product or a computer program. The computer program product or the computer program includes computer instructions, and the computer instructions are stored in a computer-readable storage medium. The processor of the computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device executes the methods provided in the various optional implementation manners described in the embodiments of the present application.

[0038] The present invention provides an expansion valve detection method, device, medium, and device. When a self-check instruction is triggered, first control the first expansion valve and the second expansion valve to open to a preset opening degree, and at the same time obtain the first outer pipe temperature of the first system and the second outer pipe temperature of the second system at this time. Then control the first system to operate in a preset working mode, and then obtain the third outer pipe temperature of the first system and the fourth outer pipe temperature of the second system at this time. Finally, by comparing the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature, it is determined whether the first expansion valve is misinstalled or damaged. The core advantage of this method is that through the accurate analysis of temperature differences, it can timely detect and diagnose expansion valve failures, avoiding the problems of reduced air-conditioning performance or abnormal operation caused by the failure of the expansion valve not being detected early in the traditional method, thereby greatly improving the reliability and service life of the air-conditioning system and ensuring the user experience of consumers. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0040] Among them:

[0041] Figure 1 is a schematic flowchart of the expansion valve detection method;

[0042] Figure 2It is a structural schematic diagram of an expansion valve detection device;

[0043] Figure 3 It is a structural block diagram of a terminal device. Specific implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0045] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products or devices.

[0046] Referring to "embodiment" herein means that a specific feature, structure or characteristic described in connection with the embodiment can be included in at least one embodiment of this application. The phrase appears in various places in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0047] Please refer to Figure 1 , Figure 1 It is a flowchart of the expansion valve detection method provided by the embodiment of this application. Although the logical order is shown in the flowchart, in some cases, the steps shown or described can be executed in a different order than that shown in the drawings. The embodiments of this application are applied to a multi-system air conditioner. A multi-system air conditioner refers to an air conditioner system that includes at least two independent air conditioner systems. This design allows the air conditioning needs of multiple rooms or areas to be met simultaneously, improving the flexibility and efficiency of the air conditioner. Multi-system air conditioners include, but are not limited to, commercial control schemes in which two outdoor units control two fluorine systems, one-to-many schemes in which one outdoor unit corresponds to multiple indoor units, etc.

[0048] Specifically, the specific process of the expansion valve detection method in the embodiment of this application is as follows:

[0049] S101. When a self-check instruction is triggered, control the first expansion valve of the first system and the second expansion valve of the second system to open to a first preset opening degree, and obtain the current first outer pipe temperature of the first system and the current second outer pipe temperature of the second system.

[0050] Among them, the self-check instruction is an instruction for the air-conditioning system to independently perform a series of diagnoses to detect whether there are any faults or abnormalities without external intervention. The self-check instruction is usually triggered by the user through the air-conditioning control panel, remote control or mobile application, and can also be automatically triggered inside the air-conditioning system at startup or during regular maintenance, and generally occurs in the initial inspection link of production. The first system is the air-conditioning system in which the self-check instruction indicates to perform fault detection among at least two air-conditioning systems, and the second system is another air-conditioning system among at least two air-conditioning systems other than the first system. The expansion valve is a control device for regulating the refrigerant flow rate to ensure that the air-conditioning system can operate reasonably according to the load demand. Since there are at least two air-conditioning systems, there are at least two expansion valves to be detected in a multi-system air conditioner. The outer pipe temperature refers to the surface temperature of the pipe in the corresponding air-conditioning system that is in contact with the external environment.

[0051] Exemplarily, in a multi-system air conditioner including air-conditioning system A and air-conditioning system B, during the initial inspection link of the production of the multi-system air conditioner, the self-check instruction is triggered, and this self-check instruction is used to indicate the fault detection of air-conditioning system A. Therefore, air-conditioning system A is used as the first system, and air-conditioning system B is used as the second system. Then send an instruction to start the first expansion valve of the first system and open it to the preset first opening degree. At the same time, start the second expansion valve of the second system to ensure that the refrigerant flow rates of the two systems are at a certain level. Finally, the temperature sensors in the two air-conditioning systems respectively start to record the relevant temperature data on the exhaust pipe: the first outer pipe temperature of the first system and the second outer pipe temperature of the second system.

[0052] S102. Control the first system to operate in a preset working mode, and obtain the current third outer pipe temperature of the first system and the current fourth outer pipe temperature of the second system.

[0053] Among them, "operating in a preset working mode" here means that the air-conditioning system works in a predetermined operating mode (such as cooling, heating, dehumidifying, etc.) during the self-check process.

[0054] Exemplarily, control the first system to maintain operation for 2 minutes in the cooling mode and then stop running. Finally, the temperature sensors in the air-conditioning system respectively start to record the relevant temperature data on the exhaust pipe: the third outer pipe temperature of the first system and the fourth outer pipe temperature of the second system. Of course, it is best to require that the temperature measurement points in this step are the same as those in S101.

[0055] S103. Determine the fault condition of the first expansion valve based on the first temperature difference between the temperature of the third outer pipe and the temperature of the first outer pipe, and the second temperature difference between the temperature of the fourth outer pipe and the temperature of the second outer pipe.

[0056] Among them, the first temperature difference refers to the temperature difference between the temperature of the third outer pipe and the temperature of the first outer pipe, and the second temperature difference refers to the temperature difference between the temperature of the fourth outer pipe and the temperature of the second outer pipe. By combining the magnitudes of these two temperature differences, the working condition of the first expansion valve before and after the operation of the first system can be evaluated, and further determine whether the first expansion valve is misinstalled.

[0057] Exemplarily, if both the first temperature difference and the second temperature difference are within a normal range (i.e., meet the preset standard), it can be determined that the first expansion valve is normal; conversely, if the first temperature difference or the second temperature difference undergoes an abnormal change (i.e., does not meet the preset standard), it can be determined that the first expansion valve has a fault.

[0058] Of course, it can be understood that the above steps S101 - S103 only detect whether the first expansion valve has a fault, and a multi - system air conditioner includes at least two expansion valves. Therefore, if the first system is specified based on a preset order in at least two air - conditioning systems in the self - inspection instruction, or a self - inspection instruction for the remaining expansion valves is triggered subsequently, after the multi - system air conditioner stabilizes, steps S101 - S103 can be repeated to continue the fault detection, so as to achieve a complete detection of the multi - system air conditioner.

[0059] In the above expansion valve detection method, when the self - inspection instruction is triggered, first control the first expansion valve and the second expansion valve to open to a preset opening degree, and simultaneously obtain the temperature of the first outer pipe of the first system and the temperature of the second outer pipe of the second system at this time. Then control the first system to operate in a preset working mode, and then obtain the temperature of the third outer pipe of the first system and the temperature of the fourth outer pipe of the second system at this time. Finally, by comparing the first temperature difference between the temperature of the third outer pipe and the temperature of the first outer pipe, and the second temperature difference between the temperature of the fourth outer pipe and the temperature of the second outer pipe, determine whether the first expansion valve is misinstalled or damaged. The core advantage of this method is that through the accurate analysis of temperature differences, it can timely detect and diagnose expansion valve faults, avoiding the problems of reduced air - conditioner performance or inability to operate normally caused by the failure to detect expansion valve faults early in traditional methods, thus greatly improving the reliability and service life of the air - conditioner system and ensuring the user experience of consumers.

[0060] Optionally, in some embodiments of the present application, the preset working mode is the refrigeration mode. The specific steps for determining the fault condition of the first expansion valve in S103 based on the first temperature difference between the temperature of the third outer pipe and the temperature of the first outer pipe, and the second temperature difference between the temperature of the fourth outer pipe and the temperature of the second outer pipe are as follows:

[0061] A1. If the first temperature difference is greater than a preset first temperature difference threshold and the second temperature difference is less than or equal to the first temperature difference threshold, it is determined that the first expansion valve is correctly installed.

[0062] Among them, in the refrigeration mode, the first temperature difference threshold here is a preset positive number.

[0063] This is because when the first system operates in the refrigeration mode, the outer tube temperature of the first system will increase due to the operation of the compressor. If the first expansion valve is correctly installed, the heat exchange effect of the first system is good, so it is manifested that the first temperature difference is greater than the preset first temperature difference threshold. And since the second system is not operating, the change in its outer tube temperature is not obvious, manifested as the second temperature difference being less than or equal to the first temperature difference threshold.

[0064] A2. If the first temperature difference is less than or equal to the first temperature difference threshold and the second temperature difference is greater than the first temperature difference threshold, it is determined that the first expansion valve is incorrectly installed.

[0065] This is because if the first expansion valve is installed incorrectly and the first system operates in the refrigeration mode, it will cause the refrigerant flow rate in the first system to be restricted, and the heat exchange effect of the first system is poor, so it is manifested that the first temperature difference is less than or equal to the first temperature difference threshold. And the incorrect installation of the first expansion valve leads to a large amount of refrigerant flowing into the second system, causing the temperature of its condenser to rise abnormally, so it is manifested that the second temperature difference is greater than the first temperature difference threshold.

[0066] Optionally, in some embodiments of the present application, the preset working mode is the refrigeration mode. In addition to performing the above A1 and A2, the following steps can also be performed:

[0067] A3. If the first temperature difference is greater than the first temperature difference threshold and the second temperature difference is greater than the first temperature difference threshold, it is determined that the outer pipeline between the first system and the second system is connected.

[0068] This is because if the outer pipeline between the first system and the second system is connected, such as the pipeline is cross-connected, when the compressor of the first system operates, the refrigerant circulates between the two systems, resulting in the synchronous rise of the temperatures of the two systems, so it is manifested that the first temperature difference is greater than the first temperature difference threshold and the second temperature difference is greater than the first temperature difference threshold.

[0069] A4. If the first temperature difference is less than or equal to the first temperature difference threshold and the second temperature difference is less than or equal to the first temperature difference threshold, it is determined that the multi-system air conditioner is abnormal.

[0070] Among them, the abnormal conditions of the multi-system air conditioner include, but are not limited to, expansion valve blockage, compressor failure, and refrigerant leakage. For example, when the expansion valve is blocked, since the refrigerant cannot flow, there is no obvious temperature change, manifested as the first temperature difference being less than or equal to the first temperature difference threshold, and the second temperature difference being less than or equal to the first temperature difference threshold. When the compressor fails, since the pressure difference cannot be established and the refrigerant circulation stagnates, there is no obvious temperature change, manifested as the first temperature difference being less than or equal to the first temperature difference threshold, and the second temperature difference being less than or equal to the first temperature difference threshold. When the refrigerant leaks, the refrigerant flow is insufficient, and the system cannot effectively respond to the compressor operation, so there is no obvious temperature change, manifested as the first temperature difference being less than or equal to the first temperature difference threshold, and the second temperature difference being less than or equal to the first temperature difference threshold.

[0071] In the above embodiment, by comparing the temperature changes before and after the compressor operates in the refrigeration mode, the rapid diagnosis of the installation state of the expansion valve and the integrity of the pipeline is realized. Its effectiveness depends on the sensitivity of the temperature change and the reasonable setting of the preset threshold, and is applicable to the production inspection link of multi-system air conditioners.

[0072] Optionally, in some embodiments of the present application, the preset working mode is the heating mode. In S103, the fault condition of the first expansion valve is judged according to the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature, including:

[0073] B1, if the first temperature difference is less than or equal to the preset second temperature difference threshold, and the second temperature difference is greater than the second temperature difference threshold, it is determined that the first expansion valve is correctly installed.

[0074] Among them, in the heating mode, the second temperature difference threshold here is a preset negative number.

[0075] This is because if the first system operates in the heating mode, the outer pipe temperature of the first system will decrease due to the operation of the compressor. If the first expansion valve is correctly installed, the heat exchange effect of the first system is good, so it is manifested that the first temperature difference is less than or equal to the preset second temperature difference threshold. And since the second system does not operate, the change in its outer pipe temperature is not obvious, manifested as the second temperature difference being greater than the second temperature difference threshold.

[0076] B2, if the first temperature difference is greater than the second temperature difference threshold, and the second temperature difference is less than or equal to the second temperature difference threshold, it is determined that the first expansion valve is incorrectly installed.

[0077] This is because if the first expansion valve is installed incorrectly and the first system operates in the heating mode, the refrigerant flow rate in the first system will be restricted, and the heat exchange effect of the first system will be poor. Therefore, it is manifested as the first temperature difference being greater than the second temperature difference threshold. Moreover, the incorrect installation of the first expansion valve causes a large amount of refrigerant to flow into the second system, resulting in an abnormal decrease in the condenser temperature of the second system. Therefore, it is manifested as the second temperature difference being less than or equal to the second temperature difference threshold.

[0078] Optionally, in some embodiments of the present application, the preset operating mode is the heating mode. In addition to performing the above steps B1 and B2, the following steps can also be performed:

[0079] B3. If the first temperature difference is less than or equal to the second temperature difference threshold and the second temperature difference is less than or equal to the second temperature difference threshold, it is determined that the external pipeline between the first system and the second system is connected.

[0080] This is because if the external pipeline between the first system and the second system is connected, such as pipeline cross-connection, when the compressor of the first system operates, the refrigerant circulates between the two systems, resulting in the synchronous decrease of the temperatures of the two systems. Therefore, it is manifested as the first temperature difference being less than or equal to the second temperature difference threshold and the second temperature difference being less than or equal to the second temperature difference threshold.

[0081] B4. If the first temperature difference is greater than the second temperature difference threshold and the second temperature difference is greater than the second temperature difference threshold, it is determined that the multi-system air conditioner is abnormal.

[0082] Among them, the abnormal situations of the multi-system air conditioner here include but are not limited to expansion valve blockage, compressor failure, and refrigerant leakage. For example, when the expansion valve is blocked, since the refrigerant cannot flow, there is no obvious temperature change, which is manifested as the first temperature difference being greater than the second temperature difference threshold and the second temperature difference being greater than the second temperature difference threshold. When the compressor fails, since the pressure difference cannot be established and the refrigerant circulation stagnates, there is no obvious temperature change, which is manifested as the first temperature difference being greater than the second temperature difference threshold and the second temperature difference being greater than the second temperature difference threshold. When the refrigerant leaks, the refrigerant flow rate is insufficient, and the system cannot effectively respond to the operation of the compressor. Therefore, there is no obvious temperature change, which is manifested as the first temperature difference being greater than the second temperature difference threshold and the second temperature difference being greater than the second temperature difference threshold.

[0083] In the above embodiments, by comparing the temperature changes before and after the compressor operates in the heating mode, the rapid diagnosis of the installation state of the expansion valve and the integrity of the pipeline is realized. Its effectiveness depends on the sensitivity of the temperature change and the reasonable setting of the preset threshold, and it is applicable to the production inspection link of the multi-system air conditioner.

[0084] Optionally, in some embodiments of the present application, the above expansion valve detection method can also perform the following steps:

[0085] S201, when a commodity inspection instruction is received, control the third expansion valve of the third system to open to a second preset opening degree, and control the fourth expansion valve of the fourth system to open to a third preset opening degree.

[0086] Among them, the commodity inspection instruction refers to an instruction issued by a manufacturer, a regulatory agency, or a testing agency for quality inspection and compliance inspection of air conditioning equipment or other commercial equipment. The commodity inspection instruction is generally executed by relevant regulatory agencies or professional technicians before equipment production, before leaving the factory, or before entering the market for sale to ensure that the equipment meets relevant quality standards and regulatory requirements. The third system is the air conditioning system in at least two air conditioning systems where the commodity inspection instruction indicates to perform fault detection, and the fourth system is another air conditioning system in at least two air conditioning systems other than the third system. In the embodiment of the present application, it is set that the opening degrees of the second preset opening degree and the third preset opening degree are different, so that the operating parameters of the expansion valves of at least two air conditioning systems are different, and the qualification status of the multi-system air conditioner can be comprehensively judged by combining other parameters later.

[0087] Exemplarily, in a multi-system air conditioner including air conditioning system A and air conditioning system B, during the commodity inspection link before the multi-system air conditioner leaves the factory, the multi-system air conditioner receives a commodity inspection instruction, where this commodity inspection instruction is used to indicate fault detection of air conditioning system A. Therefore, air conditioning system A is used as the third system, and air conditioning system B is used as the fourth system. Then, send an instruction to start the third expansion valve of the third system and open it to the second preset opening degree a, and at the same time start the fourth expansion valve of the fourth system and open it to the third preset opening degree b.

[0088] S202, control the first system and the second system to operate in a preset working mode, obtain the first exhaust temperature and the first phase current of the current first system, and obtain the second exhaust temperature and the second phase current of the current second system.

[0089] Among them, "operating in a preset working mode" here means that the air conditioning system works in a predetermined operation mode (such as refrigeration, heating, dehumidification, etc.) during the commodity inspection process. Here, controlling the first system and the second system to operate in the same preset working mode is to ensure that except for the different operating parameters of the expansion valves, the remaining parameters are all consistent, avoiding introducing irrelevant variables. The first exhaust temperature refers to the temperature at the exhaust port of the first system compressor. The first phase current refers to the current value of the first system compressor. The second exhaust temperature refers to the temperature at the exhaust port of the second system compressor. The second phase current refers to the current value of the second system compressor.

[0090] Exemplarily, when controlling the first system and the second system in the refrigeration mode, they are maintained at the same frequency for operation for 2 minutes and then stopped. Finally, the temperature sensors in at least two air conditioning systems start to record the relevant temperature data at the compressor exhaust port: the first exhaust temperature of the first system and the second exhaust temperature of the second system. And the current sensors in at least two air conditioning systems start to record the relevant phase current data: the first phase current of the first system and the second phase current of the second system.

[0091] S203. Determine the qualification status of the multi-system air conditioner based on the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the phase current difference between the second phase current and the first phase current.

[0092] Among them, the third temperature difference refers to the temperature difference between the second exhaust temperature and the first exhaust temperature, and the phase current difference refers to the current difference between the second phase current and the first phase current. By combining the magnitudes of these two differences, the working conditions of the first expansion valve of the third system and the second expansion valve of the fourth system can be comprehensively evaluated, and then the qualification status of the multi-system air conditioner can be determined.

[0093] Exemplarily, if both the third temperature difference and the phase current difference are within a normal range (i.e., meeting the preset standard), it can be determined that the multi-system air conditioner is qualified; conversely, if the third temperature difference or the phase current difference shows abnormal changes (i.e., not meeting the preset standard), it can be determined that the multi-system air conditioner is unqualified.

[0094] Of course, it can be understood that the above steps S201 - S203 only detect whether there is a fault in the third expansion valve, and there are at least two expansion valves in the multi-system air conditioner. Therefore, if the third system is specified in at least two air conditioning systems based on a preset order in the commodity inspection instruction, or a commodity inspection instruction for the remaining expansion valves is triggered later, after the multi-system air conditioner stabilizes, steps S201 - S203 can be repeated to continue the fault detection, so as to achieve a complete detection of the multi-system air conditioner.

[0095] In the above embodiment, by controlling the expansion valves of the third system and the fourth system at different preset opening degrees under the commodity inspection instruction, then uniformly controlling the first system and the second system to operate in the same working mode, and real-time collecting the compressor exhaust temperature and phase current data of each system, and then calculating the third temperature difference and the phase current difference between the second exhaust temperature and the first exhaust temperature; by comparing these two differences with the preset standard, this method not only eliminates the interference of other variables except for the differences in the operating parameters of the expansion valves, but also can accurately reflect the working state of the core components of the air conditioner, thus achieving an accurate judgment of the qualification status of the multi-system air conditioner, and through timely detection and analysis, effectively improving the product quality control and market competitiveness.

[0096] Optionally, in some embodiments of the present application, the second preset opening degree is greater than the third preset opening degree, and the preset working mode operates in the refrigeration mode at a preset frequency. In S203, the qualification of the multi-system air conditioner is judged according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the current difference between the second phase current and the first phase current. The specific steps are as follows:

[0097] C1. If the first judgment condition is satisfied, it is determined that the multi-system air conditioner is qualified; if the first judgment condition is not satisfied, it is determined that the multi-system air conditioner is unqualified.

[0098] Among them, the first judgment condition is that the third temperature difference is greater than the preset third temperature difference threshold, and the phase current difference is greater than the preset first phase current threshold. In the refrigeration mode at the same frequency, the third temperature difference threshold here is a preset positive number, and the first phase current threshold here is also a preset positive number.

[0099] This is because in the refrigeration mode at the same frequency, if the second preset opening degree of the third system is greater than the third preset opening degree of the fourth system, it means that more refrigerant enters the evaporator of the third system, which will cause the evaporation pressure of the third system to be higher than that of the fourth system, that is, the suction pressure of the compressor of the third system is greater than that of the compressor of the fourth system. Under the condition that other conditions are the same and relatively stable, the exhaust pressure of the compressor of the third system is the same as or close to that of the compressor of the fourth system. Then, based on the compression ratio formula of the compressor:

[0100]

[0101] It can be known that the compression ratio of the third system is less than that of the fourth system. And a higher compression ratio means that the compressor needs to do more work to compress the refrigerant, which will cause the exhaust temperature to rise further. Therefore, it is manifested that the third temperature difference is greater than the preset third temperature difference threshold. At the same time, a larger compression ratio will also increase the load of the compressor, resulting in a higher current consumption. Therefore, it is manifested that the phase current difference is greater than the preset first phase current threshold.

[0102] Therefore, if the first judgment condition is satisfied, it is determined that the multi-system air conditioner is qualified. On the contrary, if the first judgment condition is not satisfied, it is determined that the multi-system air conditioner is unqualified.

[0103] The above embodiments provide a scientific method for "how to judge the qualification of a multi-system air conditioner" based on the relationship between internal parameters of the system. By comparing and analyzing parameters such as the opening degree, temperature, and current of different systems, it can accurately judge whether the performance of the multi-system air conditioner meets the standards, which helps to ensure product quality and timely discover and solve possible problems.

[0104] Optionally, in some embodiments of the present application, the second preset opening degree is greater than the third preset opening degree, and the preset working mode operates in a heating mode at a preset frequency. In S203, the qualification of the multi-system air conditioner is determined according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the current difference between the second phase current and the first phase current. The specific steps are as follows:

[0105] D1. If the second judgment condition is satisfied, it is determined that the multi-system air conditioner is qualified; if the second judgment condition is not satisfied, it is determined that the multi-system air conditioner is unqualified.

[0106] Among them, the second judgment condition is that the third temperature difference is less than or equal to a preset fourth temperature difference threshold, and the phase current difference is greater than a preset second phase current threshold. In the heating mode at the same frequency, the fourth temperature difference threshold here is a preset negative number, and the second phase current threshold here is a preset positive number.

[0107] This is because in the heating mode at the same frequency, if the second preset opening degree of the third system is greater than the third preset opening degree of the fourth system, it means that more refrigerant enters the evaporator of the third system, which will cause the evaporation pressure of the third system to be higher than that of the fourth system, that is, the suction pressure of the compressor of the third system is greater than that of the compressor of the fourth system. Under the condition that other conditions are the same and relatively stable, the exhaust pressure of the compressor of the third system is the same as or close to that of the compressor of the fourth system. Then, based on the compression ratio formula of the compressor:

[0108]

[0109] It can be known that the compression ratio of the third system is less than that of the fourth system. And a higher compression ratio means that the compressor needs to do more work to compress the refrigerant, which will cause the exhaust temperature to further decrease. Therefore, it is manifested that the third temperature difference is less than or equal to the preset third temperature difference threshold. At the same time, a larger compression ratio will also increase the load of the compressor, resulting in a higher current consumption. Therefore, it is manifested that the phase current difference is greater than the preset second phase current threshold.

[0110] Therefore, if the second judgment condition is satisfied, it is determined that the multi-system air conditioner is qualified. On the contrary, if the second judgment condition is not satisfied, it is determined that the multi-system air conditioner is unqualified.

[0111] The above embodiments provide another scientific method for "how to determine the qualification of a multi-system air conditioner" based on the relationship of internal system parameters. By comparing and analyzing parameters such as the opening degree, temperature, and current of different systems, it can accurately judge whether the performance of the multi-system air conditioner meets the standards, which helps to ensure product quality and timely discover and solve possible problems.

[0112] To facilitate better implementation of the expansion valve detection method of the present application, the present application also provides an expansion valve detection device based on the above-mentioned expansion valve detection method. The meanings of the terms are the same as those in the above-mentioned expansion valve detection method, and the specific implementation details can be referred to the descriptions in the method embodiments.

[0113] Please refer to Figure 2 , Figure 2 which is a schematic structural diagram of the expansion valve detection device provided by the embodiment of the present application, and specifically may include:

[0114] A first parameter acquisition module 201, configured to, when a self-check instruction is triggered, control the first expansion valve of the first system and the second expansion valve of the second system to open to a first preset opening degree, and acquire the first outer pipe temperature of the current first system and the second outer pipe temperature of the current second system; wherein, the first system is the air-conditioning system for which the self-check instruction indicates to perform fault detection among at least two air-conditioning systems, and the second system is another air-conditioning system other than the first system among at least two air-conditioning systems; and control the first system to operate in a preset working mode, and acquire the third outer pipe temperature of the current first system and the fourth outer pipe temperature of the current second system;

[0115] A first detection module 202, configured to judge the fault condition of the first expansion valve according to the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature.

[0116] For the above-mentioned expansion valve detection device, the first parameter acquisition module 201 is configured to, when the self-check instruction is triggered, first control the first expansion valve and the second expansion valve to open to a preset opening degree, and simultaneously acquire the first outer pipe temperature of the first system and the second outer pipe temperature of the second system at this time. Then control the first system to operate in a preset working mode, and acquire the third outer pipe temperature of the first system and the fourth outer pipe temperature of the second system at this time. Finally, the first detection module 202 is configured to judge whether the first expansion valve is misinstalled or damaged by comparing the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature. The core advantage of this method is that through precise analysis of temperature differences, it can timely detect and diagnose expansion valve faults, avoiding the problems of reduced air-conditioning performance or abnormal operation caused by failure to detect expansion valve faults in a timely manner in traditional methods, thereby greatly improving the reliability and service life of the air-conditioning system and ensuring the user experience of consumers.

[0117] In some embodiments of the present application, the preset working mode is the refrigeration mode. The first detection module 202 is specifically configured to: if the first temperature difference is greater than the preset first temperature difference threshold and the second temperature difference is less than or equal to the first temperature difference threshold, determine that the first expansion valve is correctly installed; if the first temperature difference is less than or equal to the first temperature difference threshold and the second temperature difference is greater than the first temperature difference threshold, determine that the first expansion valve is incorrectly installed; if the first temperature difference is greater than the first temperature difference threshold and the second temperature difference is greater than the first temperature difference threshold, determine that the external pipeline between the first system and the second system is connected; if the first temperature difference is less than or equal to the first temperature difference threshold and the second temperature difference is less than or equal to the first temperature difference threshold, determine that the multi-system air conditioner is abnormal.

[0118] In some embodiments of the present application, the preset working mode is the heating mode. The first detection module 202 is specifically configured to: if the first temperature difference is less than or equal to the preset second temperature difference threshold and the second temperature difference is greater than the second temperature difference threshold, determine that the first expansion valve is correctly installed; if the first temperature difference is greater than the second temperature difference threshold and the second temperature difference is less than or equal to the second temperature difference threshold, determine that the first expansion valve is incorrectly installed; if the first temperature difference is less than or equal to the second temperature difference threshold and the second temperature difference is less than or equal to the second temperature difference threshold, determine that the external pipeline between the first system and the second system is connected; if the first temperature difference is greater than the second temperature difference threshold and the second temperature difference is greater than the second temperature difference threshold, determine that the multi-system air conditioner is abnormal.

[0119] In some embodiments of the present application, the expansion valve detection device further includes: a control module 203, configured to, when receiving a commodity inspection instruction, control the third expansion valve of the third system to open to a second preset opening degree, and control the fourth expansion valve of the fourth system to open to a third preset opening degree; wherein, the third system is the air conditioner system for which the commodity inspection instruction indicates to perform fault detection among at least two air conditioner systems, and the fourth system is another air conditioner system other than the third system among at least two air conditioner systems, and the second preset opening degree and the third preset opening degree are different. A second parameter acquisition module 204, configured to control the first system and the second system to operate in a preset working mode, acquire the first exhaust temperature and the first phase current of the current first system, and acquire the second exhaust temperature and the second phase current of the current second system; a second detection module 205, configured to determine the qualification of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature and the phase current difference between the second phase current and the first phase current.

[0120] In some embodiments of the present application, the second preset opening degree is greater than the third preset opening degree, and the preset working mode is the refrigeration mode at a preset frequency. The second detection module 205 is specifically configured to: if the first judgment condition is satisfied, determine that the multi-system air conditioner is qualified; if the first judgment condition is not satisfied, determine that the multi-system air conditioner is unqualified; wherein, the first judgment condition is that the third temperature difference is greater than the preset third temperature difference threshold and the phase current difference is greater than the preset first phase current threshold.

[0121] In some embodiments of the present application, the second preset opening degree is greater than the third preset opening degree, and the preset working mode operates in a heating mode at a preset frequency. The second detection module 205 is specifically configured to: if the second judgment condition is satisfied, determine that the multi-system air conditioner is qualified; if the second judgment condition is not satisfied, determine that the multi-system air conditioner is unqualified; wherein, the second judgment condition is that the third temperature difference is less than or equal to a preset fourth temperature difference threshold, and the phase current difference is greater than a preset second phase current threshold.

[0122] In addition, the present application also provides a terminal device, as Figure 3 shown, which shows a schematic structural diagram of the terminal device involved in the present application. Specifically:

[0123] The terminal device may include a processor 301 with one or more processing cores, a memory 302 with one or more computer-readable storage media, a power supply 303, an input unit 304, and other components. Those skilled in the art can understand that Figure 3 the structural diagram of the terminal device shown in does not constitute a limitation on the terminal device, and it may include more or fewer components than shown in the figure, or combine certain components, or have different component arrangements.

[0124] Among them:

[0125] The processor 301 is the control center of the terminal device, connecting various parts of the entire terminal device through various interfaces and lines. By running or executing software programs and / or modules stored in the memory 302, and by calling data stored in the memory 302, it executes various functions of the terminal device and processes data, thereby monitoring the terminal device as a whole. Optionally, the processor 301 may include one or more processing cores; preferably, the processor 301 may integrate an application processor and a modulation and demodulation processor. Among them, the application processor mainly processes the operating system, user interface, and application programs, etc., and the modulation and demodulation processor mainly processes wireless communication. It can be understood that the above modulation and demodulation processor may not be integrated into the processor 301.

[0126] The memory 302 can be used to store software programs and modules. The processor 301 executes various functional applications and data processing by running the software programs and modules stored in the memory 302. The memory 302 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function, etc.; the data storage area can store data created according to the use of the terminal device, etc. In addition, the memory 302 can include high-speed random access memory and can also include non-volatile memory, such as at least one disk storage device, a flash memory device, or other volatile solid-state storage devices. Correspondingly, the memory 302 can also include a memory controller to provide the processor 301 with access to the memory 302.

[0127] The terminal device also includes a power supply 303 for powering each component. Preferably, the power supply 303 can be logically connected to the processor 301 through a power management system, so as to implement functions such as management of charging, discharging, and power consumption management through the power management system. The power supply 303 can also include any components such as one or more DC or AC power supplies, a recharge system, a power device debugging circuit, a power converter or inverter, and a power status indicator.

[0128] The terminal device may further include an input unit 304, which can be used to receive input digital or character information, and generate keyboard, mouse, joystick, optical or trackball signal inputs related to user settings and function controls.

[0129] Although not shown, the terminal device may further include a display unit, etc., which will not be elaborated here. Specifically, in this embodiment, the processor 301 in the terminal device will load the executable files corresponding to the processes of one or more application programs into the memory 302 according to the following instructions, and the processor 301 will run the application programs stored in the memory 302, so as to implement the steps in any of the expansion valve detection methods provided in the embodiments of the present application: when a self-check instruction is triggered, control the first expansion valve of the first system and the second expansion valve of the second system to open to a first preset opening degree, and obtain the current first outer pipe temperature of the first system and the current second outer pipe temperature of the second system; where the first system is the air-conditioning system for which the self-check instruction indicates a fault detection among at least two air-conditioning systems, and the second system is another air-conditioning system other than the first system among at least two air-conditioning systems; control the first system to operate in a preset working mode, and obtain the current third outer pipe temperature of the first system and the current fourth outer pipe temperature of the second system; judge the fault condition of the first expansion valve according to the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature.

[0130] In the above expansion valve detection method, when the self-check instruction is triggered, first control the first expansion valve and the second expansion valve to open to a preset opening degree, and at the same time obtain the first outer pipe temperature of the first system and the second outer pipe temperature of the second system at this time. Then control the first system to operate in a preset working mode, and then obtain the third outer pipe temperature of the first system and the fourth outer pipe temperature of the second system at this time. Finally, by comparing the first temperature difference between the third outer pipe temperature and the first outer pipe temperature, and the second temperature difference between the fourth outer pipe temperature and the second outer pipe temperature, it is determined whether the first expansion valve is misinstalled or damaged. The core advantage of this method is that through the accurate analysis of temperature differences, it can timely detect and diagnose expansion valve faults, avoiding the problems of reduced air-conditioning performance or abnormal operation caused by the failure to detect expansion valve faults in a timely manner in traditional methods, thus greatly improving the reliability and service life of the air-conditioning system and ensuring the user experience of consumers.

[0131] For the specific implementation of each of the above operations, reference can be made to the previous embodiments and will not be elaborated here.

[0132] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructions, or by controlling relevant hardware through instructions. The instructions can be stored in a computer-readable storage medium and loaded and executed by a processor.

[0133] Therefore, the present application provides a computer-readable storage medium on which a computer program is stored. The computer program can be loaded by a processor to execute the steps in any of the expansion valve detection methods provided by the present application.

[0134] For the specific implementation of each of the above operations, reference can be made to the previous embodiments and will not be elaborated here.

[0135] Among them, the computer-readable storage medium may include: read-only memory (ROM, Read Only Memory), random access memory (RAM, Random Access Memory), magnetic disk or optical disk, etc.

[0136] Since the instructions stored in the computer-readable storage medium can execute the steps in any of the expansion valve detection methods provided by the present application, the beneficial effects achievable by any of the expansion valve detection methods provided by the present application can be realized. For details, reference can be made to the previous embodiments and will not be elaborated here.

[0137] The above has introduced in detail a method, device, terminal device, and computer-readable storage medium for detecting an expansion valve. Specific examples are used in this article to elaborate on the principles and implementation manners of the present invention. The descriptions of the above embodiments are only used to help understand the method and its core idea of the present invention; at the same time, for those skilled in the art, according to the idea of the present invention, there will be changes in the specific implementation manners and application scopes. In summary, the content of this specification should not be construed as a limitation to the present invention.

Claims

1. A method for detecting an expansion valve, characterized in that: Applied to a multi-system air conditioner, the multi-system air conditioner includes at least two air conditioning systems, and the method includes: When the self-check instruction is triggered, the first expansion valve of the first system and the second expansion valve of the second system are controlled to open to a first preset opening, and the current first external tube temperature of the first system and the current second external tube temperature of the second system are obtained; wherein the first system is the air-conditioning system instructed by the self-check instruction to perform fault detection among the at least two air-conditioning systems, and the second system is another air-conditioning system other than the first system among the at least two air-conditioning systems; Controlling the first system to operate in a preset working mode, and obtaining a current temperature of the third outer tube of the first system and a current temperature of the fourth outer tube of the second system; The failure condition of the first expansion valve is determined based on a first temperature difference between the third outer tube temperature and the first outer tube temperature, and a second temperature difference between the fourth outer tube temperature and the second outer tube temperature.

2. The expansion valve detection method according to claim 1, characterized in that: The fault condition includes whether the first expansion valve is correctly installed or incorrectly installed, the preset working mode is a cooling mode, and judging the fault condition of the first expansion valve according to a first temperature difference between the third outer tube temperature and the first outer tube temperature, and a second temperature difference between the fourth outer tube temperature and the second outer tube temperature, includes: If the first temperature difference is greater than a preset first temperature difference threshold, and the second temperature difference is less than or equal to the first temperature difference threshold, it is determined that the first expansion valve is correctly installed; If the first temperature difference is less than or equal to the first temperature difference threshold, and the second temperature difference is greater than the first temperature difference threshold, it is determined that the first expansion valve is incorrectly installed.

3. The expansion valve detection method according to claim 2, characterized in that: The method further comprises: If the first temperature difference is greater than the first temperature difference threshold, and the second temperature difference is greater than the first temperature difference threshold, it is determined that the external pipeline between the first system and the second system is connected; If the first temperature difference is less than or equal to the first temperature difference threshold, and the second temperature difference is less than or equal to the first temperature difference threshold, it is determined that the multi-system air conditioning is abnormal.

4. The expansion valve detection method according to claim 1, characterized in that: The fault condition includes whether the first expansion valve is correctly installed or incorrectly installed, the preset working mode is a heating mode, and judging the fault condition of the first expansion valve according to a first temperature difference between the third outer tube temperature and the first outer tube temperature, and a second temperature difference between the fourth outer tube temperature and the second outer tube temperature, includes: If the first temperature difference is less than or equal to a preset second temperature difference threshold, and the second temperature difference is greater than the second temperature difference threshold, it is determined that the first expansion valve is installed correctly; If the first temperature difference is greater than the second temperature difference threshold, and the second temperature difference is less than or equal to the second temperature difference threshold, it is determined that the first expansion valve is incorrectly installed.

5. The expansion valve detection method according to claim 4, characterized in that: The method further comprises: If the first temperature difference is less than or equal to the second temperature difference threshold, and the second temperature difference is less than or equal to the second temperature difference threshold, it is determined that the external pipeline between the first system and the second system is connected; If the first temperature difference is greater than the second temperature difference threshold, and the second temperature difference is greater than the second temperature difference threshold, it is determined that the multi-system air conditioning is abnormal.

6. The expansion valve detection method according to claim 1, characterized in that: The method further comprises: When receiving the commodity inspection instruction, controlling the third expansion valve of the third system to open to the second preset opening degree, and controlling the fourth expansion valve of the fourth system to open to the third preset opening degree; wherein the third system is the air-conditioning system for which the commodity inspection instruction indicates to perform fault detection among the at least two air-conditioning systems, and the fourth system is another air-conditioning system other than the third system among the at least two air-conditioning systems, and the second preset opening degree is different from the third preset opening degree; Controlling the first system and the second system to operate in a preset working mode, obtaining a first exhaust temperature and a first phase current of the first system, and obtaining a second exhaust temperature and a second phase current of the second system; The qualification of the multi-system air conditioner is judged according to the third temperature difference between the second exhaust temperature and the first exhaust temperature, and the phase current difference between the second phase current and the first phase current; wherein the qualification includes qualified and unqualified.

7. The expansion valve detection method according to claim 6, characterized in that: The second preset opening is greater than the third preset opening, the preset working mode works as a cooling mode at a preset frequency, and judging the qualification of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature and the current difference between the second phase current and the first phase current includes: If the first judgment condition is met, the multi-system air conditioner is determined to be qualified; if the first judgment condition is not met, the multi-system air conditioner is determined to be unqualified; wherein, the first judgment condition is that the third temperature difference is greater than the preset third temperature difference threshold, and the phase current difference is greater than the preset first phase current threshold.

8. The expansion valve detection method according to claim 6, characterized in that: The second preset opening is greater than the third preset opening, the preset working mode works as a heating mode at a preset frequency, and judging the qualification of the multi-system air conditioner according to the third temperature difference between the second exhaust temperature and the first exhaust temperature and the current difference between the second phase current and the first phase current includes: If the second judgment condition is met, the multi-system air conditioner is determined to be qualified; if the second judgment condition is not met, the multi-system air conditioner is determined to be unqualified; wherein, the second judgment condition is that the third temperature difference is less than or equal to the preset fourth temperature difference threshold, and the phase current difference is greater than the preset second phase current threshold.

9. An expansion valve detection device, characterized in that: Applicable to a multi-system air conditioner, the multi-system air conditioner includes at least two air conditioning systems, and the expansion valve detection device includes: A first parameter acquisition module is used for, when a self-check instruction is triggered, controlling the first expansion valve of the first system and the second expansion valve of the second system to open to a first preset opening, acquiring the current first outer tube temperature of the first system, and the current second outer tube temperature of the second system; wherein the first system is the air-conditioning system instructed by the self-check instruction to perform fault detection among the at least two air-conditioning systems, and the second system is another air-conditioning system other than the first system among the at least two air-conditioning systems; and controlling the first system to operate in a preset working mode, and acquiring the current third outer tube temperature of the first system, and the current fourth outer tube temperature of the second system; The first detection module is used to determine the fault condition of the first expansion valve according to a first temperature difference between the third outer tube temperature and the first outer tube temperature, and a second temperature difference between the fourth outer tube temperature and the second outer tube temperature.

10. A computer-readable storage medium, characterized in that: A computer program is stored, and when the computer program is executed by a processor, the processor is caused to perform the steps of the method according to any one of claims 1 to 8.

11. A terminal device, characterized in that: The method comprises a memory and a processor, wherein the memory stores a computer program, and when the computer program is executed by the processor, the processor executes the steps of the method according to any one of claims 1 to 8.

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